English User`s Manual
Contents
1. 23 C Temperature air 20 to 50 C 4 0 to 122 0 F 1 C 41 8 F Temperature external K 200 to 1370 C 328 to 2498 F 0 3 rdg 1 C 1 8 F Display Sensor Type Response Time Dew Point Wet Bulb Low Battery Indicator Overrange Indicator Underrange Indicator Operating Conditions Storage Conditions Power Supply Battery Life Dimensions Weight Triple LCD Humidity Precision capacitance sensor Internal Temperature Thermistor External Temperature K Type Thermocouple 60 seconds typical 68 to 50 C 90 4 to 122 0 F calculated from RH and Air temperature measurements 21 6 to 50 C 6 88 to 122 0 F calculated from RH and Air temperature measurements Yes E2 air E5 T1 E8 T2 E3 air E6 T1 E9 T2 20 to 50 C 4 to 1227F lt 99 RH non condensing 40 to 85 C 40 to 1857F lt 99 RH non condensing 4x 1 5V AAA batteries Approx 300 hours 230 x 57 x 44mm 9 x 2 2 x 1 7 153g 5 3 oz 5 RH350 en GB_V2 5 11 14 Maintenance Cleaning and storage 1 The meter should be cleaned with a damp cloth and mild detergent when necessary Do not use solvents or abrasives 2 Store the meter in an area with moderate temperature and humidity refer to the operating and storage range in the specifications chart earlier in this manual Battery Replacement When the battery power falls low the symbol will appear on the LCD Replace the f2. ECHoLp button for 2 seconds and RECALL will blink next to the memory location number on the display 3 Press the MEM button to manually increment through the stored readings 4 Press RECHOLD MEM for more than 1 second to clear the memory 5 Press RECHoLpD for more than 1 second to return to normal operation Note In RECALL mode pressing the M AVrRsT button for min max avg readings will auto search the stored readings in memory and display the minimum maximum and average values of the stored readings Note A printer port is located on the side of the meter however it is not functional on this model Calibration The following verification and calibration procedures require the 33 and 75 RH reference bottles which are supplied with the Model RH350 CAL kit Accuracy Verification Checking the 33 or 75 RH Calibration 1 Insert meter s sensor into the 33 or 75 salt reference bottle 2 _ Check the reading after a minimum of 10 minutes 3 Verify that the reading is within the accuracy specification Relative Humidity Calibration 33 and 75 33 Calibration 1 _ Turn the meter Off 2 Insert the meter sensor into the 33 salt reference bottle 3 Allow the meter one hour to stabilize 4 While holding down the Mm AVnsr button press and hold the ON OFFsET button for 2 seconds to enter calibration mode 5 32 8 reading may vary depending on operating temperature will flash on the LCD screen Afte
3. EXTECH User Guide INSTRUMENTS Dual Input Hygro Thermometer Psychrometer Model RH350 Introduction Thank you for selecting the Extech Model RH350 This device is shipped fully tested and calibrated and with proper use will provide years of reliable service Please visit the Extech Instruments website www extech com to check for the latest version of this User Guide Meter Description 1 _ Humidity Sensor amp Air Temperature Sensor Triple LCD Display On Off Set Mode Min Max Average Reset Min Max Air T1 Air T1 Dew Point T1 probe input T2 probe input T1 T2 T2 T1 Dew Point Wet Bulb 9 Store Current Reading Backlight 10 Hold Recall Mode 11 RS232 port o o Oy o o Note The battery compartment is located on the rear of the instrument Display Description Air T1 Air T1 Dew Point Low Battery Temperature C F T2 T1 T2 T1 Dew Point Wet Bulb Temperature C F Date month day year Time 24 hour clock Memory Store Recall Location Relative Humidity Maximum Minimum Hold Average Do io OT ds ON i gt 2 RH350 en GB_V2 5 11 14 Operation Open the Protective Sensor Cap Twist the protective sensor cap located at the top of the meter counter clockwise a guarter of a turn to expose the sensors Turn Power ON or OFF Press the ON OFF button to turn power on or off The meter will perform a short self test when turned on Taking measurements 1 Hold t
4. he probe in the area to be tested Allow adeguate time for readings to stabilize The Relative Humidity measurement appears in the right display along with the date and time Air Temperature appears in the top left display Wet Bulb is in the lower left display Pressing the T1T DPsEL button toggles the top left display between Air temperature T1 temperature Air T1 and DP Dew Point 7 Pressing the T2 Awg button toggles the lower left display between WB Wet Bulb T1 T2 T2 and T1 DP Dew Point ooe onmD SETUP When the meter is off press and hold the ON OFFsET button for more than 2 seconds to enter setup mode Prnt will appear on the display 1 Selecting temperature units of measure C F Momentarily press the T1T DPsEL button until unit appears in the display Press the MEM button to toggle between C or F Press the T2 Awg button to confirm the setting and return to normal operation 2 Setting the Date Time 24 hour clock Press the T1T DPsEL button to select Year Month Day Hour and Minute in sequence Press the MEM button to change the settings Press the T2 Awg button to confirm the date time setting and return to normal operation Data Hold Press the RECHoLp button momentarily to freeze the displayed reading The HLD icon will appear on the upper right hand side of the display Press the RECHoLp button again to return to normal operation Minimum MN Maximum MX Average AVG Functi
5. on The MIN MAX Average mode allows the user to view only the lowest MN highest MX or average readings Press the M AVrstT button once and MN appears on the display The display is now showing the lowest humidity and temperature readings in memory Press the M AVrst button again and MX appears on the display The display is now showing the maximum humidity and temperature readings in memory Press the Mi AVrRstT button again to display the average AVG readings in memory To exit the MIN MAX AVG mode press the M AVnsr button To clear the current min max avg readings in memory press and hold the Mi AVnsr button for more than two seconds 3 RH350 en GB_V2 5 11 14 Backlight Display Press the M AVnRsr and MEM buttons together to turn on the backlight It will remain on for ten seconds Automatic Power OFF With the meter off press and hold down the ON OFFsET RECHoLD buttons for more than 1 second to enter auto power off settings Press the MEM button to select non sleep n or 2 5 10 20 40 and 60 minutes autosleep Press T2 A ws to confirm the selection Manual Datalogging Manual datalogging allows the user to store and recall up to 99 readings with the press of a button 1 Press the MEM button to manually store a single reading into memory The display will flash 3 times and the memory location number will be displayed below the humidity reading 2 To view stored readings press and hold the R
6. our 4 1 5 AAA batteries by removing the rear battery compartment cover and accessing the battery compartment Observe polarity when placing the batteries in the compartment Ensure that the compartment cover is securely fastened when finished Never dispose of used batteries or rechargeable batteries in household waste As consumers users are legally required to take used batteries to appropriate collection sites the retail store where the batteries were purchased or wherever mmm batteries are sold Disposal Do not dispose of this instrument in household waste The user is obligated to take end of life devices to a designated collection point for the disposal of electrical and electronic equipment Other Battery Safety Reminders o Never dispose of batteries in a fire Batteries may explode or leak o Never mix battery types Always install new batteries of the same type Copyright 2014 FLIR Systems Inc All rights reserved including the right of reproduction in whole or in part in any form www extech com 6 RH350 en GB_V2 5 11 14
7. r 30 minutes the flashing will stop to indicate that the 33 calibration is complete Note Do NOT turn off the meter 6 Proceed to the 75 Calibration below 4 RH350 en GB_V2 5 11 14 759e Calibration 1 Insert the meter sensor into the 75 salt reference bottle 2 Allow the meter one hour to stabilize 3 Press and hold the Mw AVnsr button for 2 seconds to enter the 75 calibration 4 75 3 reading may vary depending on operating temperature will flash on the LCD After 30 minutes the flashing will stop to indicate that the 75 calibration is complete 5 Calibration is now complete Turn power off Note Frequently check the water level in the salt bottles Both the 33 and 75 bottles should be completely saturated with some water present The bottles are sealed and not refillable RS 232 PC Communications Interface The meter is equipped with an RS 232 PC interface jack 3 5mm phono for connection to a PC The cable to connect the meter to the PC is included in the optional 407752 data acquisition kit The kit includes Windows compatible software that allows the user to store readings in a text file and display real time measurements in a series of selectable formats For more information or specific operating instructions refer to the User Guide included with the 407752 kit or contact Extech Specifications Function Range and Resolution Accuracy Mn 3 RH 10 to 90 O Humidity 0 0 to 100 0 RH
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